NATURAL GROUND WITH SEEPAGE LAYERS AND / OR PERVIOUS SOIL CAP MATERIAL FOR "GRANULAR BLANKET" SHALL BE GRANULAR MATERIAL CLASS II SOD AND TOPSOIL OR TOPSOIL, SEED, AND MULCH AS SPECIFIED ON PLANS CLASSED AS "GRANULAR BLANKET" 1-6" POSSIBLE PERVIOUS SOIL SEEPAGE PLANE PROPOSED POSSIBLE SEEPAGE PLANE DITCH 3-0" (ALTERNATE LOCATION) GRANULAR BLANKET TYPE 1 NATURAL GROUND WITH SEEPAGE LAYERS AND / OR PERVIOUS SOIL CAP MATERIAL FOR "GRANULAR BLANKET" SHALL BE GRANULAR MATERIAL CLASS II SOD AND TOPSOIL OR TOPSOIL SEED, AND MULCH AS CALLED FOR ON PLANS CLASSED AS "GRANULAR BLANKET" POSSIBLE PERVIOUS SOIL SEEPAGE PLANE POSSIBLE SEEPAGE PLANE DRAINAGE LAYER PROPOSED DITCH GRANULAR MATERIAL CLASS II 3" NOMINAL DEPTH 2" LAYER OF OPEN-GRADED AGGREGATE WITH GEOTEXTILE BLANKET ABOVE AND BELOW, OR THREE DIMENSIONAL MESH WITH GEOTEXTILE BLANKET ABOVE AND BELOW, OR OTHER APPROVED GEOCOMPOSITE SECTION GRANULAR MATERIAL CLASS II 12" MINIMUM DEPTH OPTION 1 THE BOTTOM THE PREFABRICATED DRAINAGE GEOCOMPOSITE SHALL BE FLUSH WITH THE SURFACE AT A MINIMUM OF 6" ABOVE DITCH BOTTOM PROPOSED DITCH PROPOSED DITCH 3-0" 6" PREFABRICATED DRAINAGE GEOCOMPOSITE WITH GEOTEXTILE ON BOTH SIDES OPTION 3 OPTION 2 NOTE: OPTION 1, 2, OR 3 WILL BE DETERMINED BY THE ENGINEER BASED ON THE PROJECT CONDITIONS. GRANULAR BLANKET TYPE 2 DEPARTMENT DIRECTOR Kirk T. Steudle Michigan Department of Transportation PREPARED BY DESIGN DIVISION APPROVED BY: DIRECTOR, BUREAU OF FIELD SERVICES DRAWN BY: B.L.T. CHECKED BY: W.K.P. APPROVED BY: DIRECTOR, BUREAU OF HIGHWAY DEVELOPMENT 1 OF 8
A SEEPAGE OUTLET TO BE LOCATED AS DIRECTED BY THE ENGINEER AREA OUTLET TO DITCH OR DRAINAGE STRUCTURE AS DIRECTED BY THE ENGINEER DITCH BOTTOM DRAINAGE MARKER POST SEEPAGE AREA (PIPE SHALL BE WRAPPED WITH GEOTEXTILE) A SOLID PIPE TO BE PAID FOR AS UNDERDRAIN OUTLET (RIGID PVC PIPE OR CORRUGATED STEEL) SECTION A - A OUTLET SEWER - TO BE REMOVED SEWER - TO BE ABANDONED SEWER - TO REMAIN IN SERVICE CAP UNDERDRAIN PIPE WITH A GEOTEXTILE MATERIAL. NOT PAID FOR SEPARATELY, BUT INCLUDED IN UNDERDRAIN OUTLET EXISTING DRAINAGE STRUCTURE 4" SOLID PIPE (RIGID PVC PIPE OR CORRUGATED STEEL) * 6-0" OF 4" TO BE PAID FOR AS UNDERDRAIN OUTLET LENGTH OF BULKHEAD SHALL EQUAL 1/3 DIAMETER OF EXISTING SEWER BUT NOT LESS THAN * WEEPER UNDERDRAIN AND BULKHEADING SEVERED SEWER 2 OF 8
PIPE DIA. + PIPE DIA. EACH SIDE 8", 12" MAX. FOR 4" DIA. PIPE 12", 16" MAX. FOR 6" DIA. PIPE DISTANCE AS DIRECTED BY THE ENGINEER DISTANCE AS DIRECTED BY THE ENGINEER SOD AND TOPSOIL OR TOPSOIL, SEED, AND MULCH AS SPECIFIED ON PLANS. SLOPE AS SPECIFIED ON PLANS GRANULAR MATERIAL CLASS II AA TOP OF SLOPE PERVIOUS SOIL GRANULAR MATERIAL CLASS II AA 6-0" MAX. EXISTING GROUND 6-0" MAX. 3-0" SEEPAGE PLANE TRENCH TO BE PLACED IN SLOPE IF THIS DIMENSION EXCEEDS 6-0" (SEE SLOPE POSITION) (SLOPE POSITION) WITH GEOTEXTILE) S DISTANCE AS DIRECTED BY THE ENGINEER 6" MINIMUM OVERLAP TOP OF SLOPE EXISTING GROUND PERVIOUS SOIL GRANULAR MATERIAL CLASS II 4-0" MAX. SEEPAGE PLANE OPEN-GRADED AGGREGATE 34-R TRENCH SHALL BE LINED WITH GEOTEXTILE BLANKET (PIPE NOT WRAPPED) 1" - 2" PIPE DIA. + PIPE DIA. EACH SIDE 8", 12" MAX. FOR 4" DIA. PIPE 12", 16" MAX. FOR 6" DIA. PIPE, OPEN-GRADED 3 OF 8
4-0" UNLESS OTHERWISE SPECIFIED 6" MINIMUM OVERLAP (DEPTH AS SPECIFIED ON PLANS) SLOPE AS SPECIFIED ON PLANS OPEN-GRADED AGGREGATE 34-R FLOW LINE ELEVATION APPROX. 5-0" DEEP UNLESS OTHERWISE SPECIFIED TRENCH SHALL BE LINED WITH GEOTEXTILE BLANKET UNDERDRAIN (PIPE SHALL NOT BE WRAPPED) 1" - 2" PIPE DIA. + PIPE DIA. EACH SIDE 8", 12" MAX. FOR 4" DIA. PIPE 12", 16" MAX. FOR 6" DIA. PIPE UNDERDRAIN - OPEN-GRADED 4-0" UNLESS OTHERWISE SPECIFIED (DEPTH AS SPECIFIED ON PLANS) SLOPE AS SPECIFIED ON PLANS GRANULAR MATERIAL CLASS II AA FLOW LINE ELEVATION APPROX. 5-0" DEEP UNLESS OTHERWISE SPECIFIED UNDERDRAIN OF LANE WIDTH UNDERDRAIN PIPE DIA. + PIPE DIA. EACH SIDE 8", 12" MAX. FOR 4" DIA. PIPE 12", 16" MAX. FOR 6" DIA. PIPE LONGITUDINAL JOINT LINE CENTER OF TRENCH 3-0" 0R AS SPECIFIED ON PLANS (DEPTH AS SPECIFIED ON PLANS) 2" GRANULAR MATERIAL CLASS II AA WHEN ADDITIONAL UNDERDRAINS ARE REQUIRED, THEY SHALL BE PLACED IN THE CENTER OF A LANE UNDERDRAIN UNDERDRAIN FLOW LINE ELEVATION NORMALLY A MAXIMUM OF 10" BELOW TOP OF OR AS SPECIFIED ON PLANS PIPE DIA. + PIPE DIA. EACH SIDE 8", 12" MAX. FOR 4" DIA. PIPE 12", 16" MAX. FOR 6" DIA. PIPE 4 OF 8
FOR HMA S GREATER THAN 4-0" IN WIDTH. OTHERWISE, CONTINUE OPEN- GRADED DRAINAGE COURSE AS SHOWN ON THE PLANS. (CRUSHED CONCRETE WILL NOT BE ALLOWED AS A DENSE GRADED AGGREGATE UNDER THE ) 3-0" OF LANE WIDTH TRENCH SHALL LONGITUDINAL JOINT LINE CENTER OF TRENCH GEOTEXTILE SEPARATOR BE LINED WITH GEOTEXTILE BLANKET 2" WHEN ADDITIONAL OPEN-GRADED UNDERDRAINS ARE REQUIRED, THEY SHALL BE PLACED IN THE CENTER OF A LANE. OPEN-GRADED DRAINAGE COURSE, 6" IN PLACE 1" - 2" OPEN-GRADED AGGREGATE 34-R, BACKFILL 2" - 3" ABOVE TOP OF TO COVER 6" LATERAL PORTION OF GEOTEXTILE BLANKET THAT LINES THE TRENCH * OPEN-GRADED UNDERDRAIN PIPE * THE OPEN-GRADED UNDERDRAIN PIPE SHALL NOT BE WRAPPED WITH GEOTEXTILE. PIPE DIA. + PIPE DIA. EACH SIDE 8", 12" MAX. FOR 4" DIA. PIPE 12", 16" MAX. FOR 6" DIA. PIPE OPEN-GRADED UNDERDRAIN PIPE WITH GEOTEXTILE SEPARATOR FOR HMA S GREATER THAN 4-0" IN WIDTH. OTHERWISE, CONTINUE OPEN- GRADED DRAINAGE COURSE AS SHOWN ON THE PLANS. (CRUSHED CONCRETE WILL NOT BE ALLOWED AS A DENSE GRADED AGGREGATE UNDER THE ) 3-0" OF LANE WIDTH TRENCH SHALL LONGITUDINAL JOINT LINE CENTER OF TRENCH SEPARATOR COURSE BE LINED WITH GEOTEXTILE BLANKET 2" WHEN ADDITIONAL OPEN-GRADED UNDERDRAINS ARE REQUIRED, THEY SHALL BE PLACED IN THE CENTER OF A LANE. OPEN-GRADED DRAINAGE COURSE, 6" IN PLACE OPEN-GRADED AGGREGATE 34-R, BACKFILL 2" - 3" ABOVE TOP OF / AGGREGATE SEPARATOR TO COVER 6" LATERAL PORTION OF GEOTEXTILE 1"- 2" BLANKET THAT LINES THE TRENCH * OPEN-GRADED UNDERDRAIN PIPE PIPE DIA. + PIPE DIA. EACH SIDE 8", 12" MAX. FOR 4" DIA. PIPE 12", 16" MAX. FOR 6" DIA. PIPE * THE OPEN-GRADED UNDERDRAIN PIPE SHALL NOT BE WRAPPED WITH GEOTEXTILE. OPEN-GRADED UNDERDRAIN PIPE WITH SEPARATOR COURSE 5 OF 8
FOR HMA S GREATER THAN 4-0" IN WIDTH. OTHERWISE, CONTINUE OPEN- GRADED DRAINAGE COURSE AS SHOWN ON THE PLANS. (CRUSHED CONCRETE WILL NOT BE ALLOWED AS A DENSE GRADED AGGREGATE UNDER THE ) GEOTEXTILE SEPARATOR 2" 2 " MAX. OPEN-GRADED DRAINAGE COURSE, 6" IN PLACE WHEN ADDITIONAL OPEN-GRADED UNDERDRAINS ARE REQUIRED, THEY SHALL BE PLACED IN THE CENTER OF A LANE. 2" * 3" - 6" MAX. TRENCH WIDTH * OPEN-GRADED AGGREGATE 34-R, BACKFILL 2" - 3" ABOVE TOP OF TO COVER 6" LATERAL PORTION OF GEOTEXTILE SEPARATOR AND TO PROTECT THE PDS FILTER COVER OPEN-GRADED UNDERDRAIN ( PDS ) WITH GEOTEXTILE SEPARATOR FOR HMA S GREATER THAN 4-0" IN WIDTH. OTHERWISE, CONTINUE OPEN- GRADED DRAINAGE COURSE AS SHOWN ON THE PLANS. (CRUSHED CONCRETE WILL NOT BE ALLOWED AS A DENSE GRADED AGGREGATE UNDER THE ) SEPARATOR COURSE 2" 2 " MAX. OPEN-GRADED DRAINAGE COURSE, 6" IN PLACE WHEN ADDITIONAL OPEN-GRADED UNDERDRAINS ARE REQUIRED, THEY SHALL BE PLACED IN THE CENTER OF A LANE. 2" * 3" - 6" MAX. TRENCH WIDTH * OPEN-GRADED AGGREGATE 34-R, BACKFILL 2" - 3" ABOVE TOP OF TO PROTECT THE PDS FILTER COVER OPEN-GRADED UNDERDRAIN ( PDS ) WITH SEPARATOR COURSE 6 OF 8
BEND 5-0" LENGTH OF UNDERDRAIN PIPE TO A 90 ARC. CONNECTION SHALL BE ACCORDING TO THE CURRENT SPECIFICATIONS OR AS APPROVED BY THE ENGINEER. END CAP SAG UNDERDRAIN OUTLET PIPE (RIGID PVC OR CORRUGATED STEEL) OUTLET ENDING 1 SYD SOD UNDERDRAIN OUTLET PIPE (RIGID PVC OR CORRUGATED STEEL) DISTANCE AS REQUIRED. BACKFILL TRENCH WITH GRANULAR MATERIAL CLASS II AA. MAXIMUM OUTLET SPACING 300 ADDITIONALLY, LOCATE OUTLETS AT THE ( LOWEST ELEVATION OF ALL VERTICAL CURVES ) PLAN SHOWING OUTLETS FOR UNDERDRAINS " x 1" x 2" STEEL FOR CONNECTOR BRACKET " X 2" GALVANIZED BOLT AND NUT " \ " " DIA. GALV. ROD DIA. HOLE " 1" REINFORCED EDGE 1" LIMITS OF UNDERDRAIN OUTLET REINFORCED EDGE DETAIL CONNECTOR BRACKET DETAIL RODENT SCREEN 4" 6" MAX. METAL END SECTION CORNER PLATES TO BE TIGHTLY SECURED USING " GALVANIZED RIVETS, BOLTS, OR EQUIVALENT SPOT WELDS PIPE DIA. 3" SKIRT LIP 3" x 5" CORNER PLATE C.M.P. 9" 4" 4" 1-8" STEEL END SECTION FOR 4" OR 6" PIPE 7 OF 8
LIMITS OF UNDERDRAIN OUTLET 3-0" 4" 3" 6" MAX. OUTLET PIPE " RADIUS 45 PIPE DIA. APPROVED CONNECTION COMPATIBLE WITH PIPE 45 4" RODENT SCREEN SOD CONCRETE RING FOR 4" OR 6" PIPE LIMITS OF UNDERDRAIN OUTLET 10" OUTLET PIPE 4" 6" MAX. NOTES: POSITIVE DRAINAGE SHALL BE PROVIDED FOR UNDERDRAINS AND UNDERDRAIN 11" OUTLETS. 4" UNDERDRAIN PIPE SIZES SHALL BE AS SPECIFIED ON THE PLANS. 2" WALL THICKNESS RODENT SCREEN APPROVED CONNECTION COMPATIBLE WITH PIPE CONCRETE END SECTION FOR 4" OR 6" PIPE CONNECTIONS BETWEEN UNDERDRAIN PIPE AND UNDERDRAIN OUTLET PIPE SHALL BE CONSTRUCTED ACCORDING TO THE CURRENT STANDARD SPECIFICATIONS AND AS APPROVED BY THE ENGINEER. CONNECTIONS, IF REQUIRED WITHIN THE OUTLET PIPE, SHALL BE ACCORDING TO APPLICABLE ASTM SPECIFICATIONS REFERENCED IN THE CURRENT STANDARD SPECIFICATIONS. THEY SHALL BE WATER TIGHT, AND OF THE SAME MATERIAL AS THE OUTLET PIPE. OUTLET CONNECTIONS TO DRAINAGE STRUCTURES SHALL BE ACCORDING TO CURRENT STANDARD SPECIFICATIONS FOR DRAINAGE STRUCTURES. UNDERDRAIN OUTLET PIPE SHALL BE RIGID PVC OR CORRUGATED METAL ONLY. INSIDE PIPE DIA. + 3" THE CONCRETE RING OR CONCRETE END SECTION SHALL BE CAST AROUND THE SAME TYPE OF PIPE AS THAT USED FOR UNDERDRAIN OUTLET PIPE. STEEL END SECTIONS SHALL BE ATTACHED TO THE ENDS OF CORRUGATED METAL PIPE AS SPECIFIED ON THIS STANDARD PLAN, BY STANDARD METAL BANDS, OR BY OTHER CONNECTING DEVICES AS APPROVED BY THE ENGINEER. 0.30" MAX. OPENING INSIDE PIPE DIA. + 1" STEEL END SECTIONS MAY ALSO BE ATTACHED TO THE ENDS OF PVC OUTLET PIPE AS APPROVED BY THE ENGINEER BY USING A PVC ADAPTER THAT PROVIDES SIMILAR RESISTANCE TO MOVEMENT OF THE CONNECTION DEVICE AS THAT PROVIDED BY STEEL PIPE CORRUGATIONS. DIRECT ATTACHMENT OF THE STEEL END SECTION TO END OF STANDARD PVC OUTLET PIPE IS NOT ACCEPTABLE. HELICALLY CORRUGATED PIPE (EXCEPT PERFORATED PIPE) SHALL HAVE THE ENDS OF THE PIPE REROLLED TO FORM ANNULAR CORRUGATIONS FOR CONNECTING THE END SECTION. 0.057" DIA. NOMINAL WIRE RODENT SCREEN 8 OF 8